A namespace in C++ is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical scopes referred to by names, allowing the elements of programs to be grouped into different scopes.

In essence, a namespace defines a scope, and it provides the space where we can define or declare identifiers such as names of variables, methods, classes, etc. Using a namespace, you can define the context in which names are defined.

A namespace definition begins with the keyword namespace followed by the namespace name, and inside the brackets, there are declarations. Namespace declarations can be nested within another namespace, and multiple namespace blocks with the same name are allowed.

C does not have a namespace mechanism similar to C++ . However, the common workaround to Cs lack of namespaces is to use a standard name prefix for each module.